Question

if the cost of 3 pens is 15.what is the cost of 6 pens?​

Answer 1

Answer:

90 answer will be 90 ok this is answer

Answer 2

Cost of 3 pens=> ₹15

=>Cost of 1 pen => 15÷3

=> ₹5

Then, cost of 6 pens =6×5

=₹30

Another method to do it->

As we know 6 is double of 3

therefore, we can double the cost of 3 pens => 15 ×2

=> ₹30

Here, cost of 6 pens is 30.